📚 Urban Forms | 城市形态
Urban form refers to the physical layout and design of a city, including the arrangement of streets, buildings, land uses and open spaces. In Edexcel A-Level Geography, understanding urban forms means examining how cities grow, why they display different spatial patterns, and how planning and socio-economic forces reshape them over time.
城市形态指的是城市的物质布局和设计，包括街道、建筑、土地利用和开放空间的安排。在爱德思 A-Level 地理课程中，理解城市形态意味着考察城市如何增长、它们为何呈现不同的空间格局，以及规划和社会经济力量如何随时间重塑城市形态。
1. Defining Urban Form | 城市形态的定义
Urban form is the physical arrangement of a city’s built environment. It covers street patterns, housing density, transport networks, land-use zones and the relationship between residential, commercial and industrial areas.
城市形态是城市建成环境的物质布局。它涵盖街道格局、住房密度、交通网络、土地利用分区，以及居住区、商业区和工业区之间的关系。
Geographers study urban form at different scales, from a single street block to the whole metropolitan region. The form of a city is not random; it reflects historical development, economic forces, cultural values and political decisions.
地理学家在不同尺度上研究城市形态，从单个街块到整个大都市区。城市形态并非随机形成，它反映了历史发展、经济力量、文化价值观和政治决策。
2. Classical Models of Urban Structure | 经典城市结构模型
The earliest systematic attempts to explain urban form came from the Chicago School in the 1920s and 1930s. These models are still examined in Edexcel specifications because they provide a useful starting point for comparing real cities.
最早系统解释城市形态的尝试来自 20 世纪 20 年代和 30 年代的芝加哥学派。这些模型在爱德思考纲中仍然被考查，因为它们为比较真实城市提供了有用的起点。
Three models dominate the classic literature: the concentric zone model, the sector model and the multiple nuclei model. Each model highlights a different process driving land-use patterns.
经典文献中主要有三种模型：同心圆模型、扇形模型和多核心模型。每个模型都强调驱动土地利用格局的不同过程。
3. The Burgess Concentric Zone Model | 伯吉斯同心圆模型
In 1925, Ernest Burgess proposed that cities expand outward in a series of concentric rings. The central business district (CBD) sits at the centre, surrounded by a zone of transition, then working-class housing, middle-class housing and finally the commuter zone.
1925 年，欧内斯特·伯吉斯提出城市以一系列同心圆向外扩展。中央商务区位于中心，周围依次是过渡地带、工人阶级住房、中产阶级住房，最后是通勤区。
The model assumes that land values and accessibility decline with distance from the CBD. Newcomers and low-income groups settle in the inner rings, while wealthier households move outward to larger homes and greener suburbs.
该模型假设土地价值和可达性随距离中央商务区而下降。新迁入者和低收入群体定居在内环，而较富裕的家庭则向外迁移到更大的住宅和更绿色的郊区。
Although useful for explaining urban growth in early 20th-century American cities, the concentric model is too simplistic for modern cities with multiple centres and edge cities.
尽管同心圆模型有助于解释 20 世纪初美国城市的增长，但它对于具有多个中心和边缘城市的现代城市来说过于简单。
4. The Hoyt Sector Model | 霍伊特扇形模型
Homer Hoyt modified the concentric model in 1939 by arguing that land uses develop in wedges or sectors rather than rings. High-rent residential areas, for example, often extend outward along major transport routes or high ground.
霍默·霍伊特于 1939 年修正了同心圆模型，认为土地利用以楔形或扇形发展，而不是环形。例如，高租金住宅区往往沿主要交通路线或高地向外延伸。
Industry tends to cluster along railway lines, rivers and canals, creating corridors of manufacturing activity. Low-income housing is frequently located near industrial zones, while middle- and high-income sectors avoid those areas.
工业往往沿铁路线、河流和运河集聚，形成制造业活动走廊。低收入住房通常位于工业区附近，而中高收入阶层则避开这些区域。
The sector model recognises the role of transport and physical geography in shaping urban form. However, it still assumes a single dominant centre and ignores later suburban employment centres.
扇形模型认识到了交通和自然地理在塑造城市形态中的作用。然而，它仍然假设单一主导中心，忽视了后来的郊区就业中心。
5. The Harris-Ullman Multiple Nuclei Model | 哈里斯-乌尔曼多核心模型
In 1945, Chauncy Harris and Edward Ullman argued that large cities do not grow around one core but around several distinct nuclei. These nuclei may include the CBD, ports, universities, airports and industrial parks.
1945 年，昌西·哈里斯和爱德华·乌尔曼提出，大城市并不是围绕一个核心发展的，而是围绕几个不同的核心发展。这些核心可能包括中央商务区、港口、大学、机场和工业园区。
Certain activities repel each other, so they separate into different nodes; others attract each other and cluster together. For example, heavy industry is unlikely to locate next to high-income housing.
某些活动相互排斥，因此它们分离到不同的节点；另一些活动相互吸引并集聚在一起。例如，重工业不太可能紧邻高收入住宅区。
This model better reflects modern metropolitan areas, where car ownership and decentralisation have created polycentric urban forms with many sub-centres.
该模型更好地反映了现代大都市区，在这些地区，汽车拥有和去中心化创造了多中心的城市形态，拥有多个次级中心。
6. Criticisms and Postmodern Urban Forms | 对传统模型的批评与后现代城市形态
The classic models were based on North American cities during a specific historical period. They assume a free-market land economy, high levels of immigration, and a dominant radial transport network.
经典模型基于特定历史时期的北美城市。它们假设自由市场的土地经济、高水平的移民以及主导的放射状交通网络。
Many cities in Europe, Asia and Latin America show quite different patterns. Colonial legacies, government planning and informal settlements produce urban forms that do not fit the Chicago models neatly.
欧洲、亚洲和拉丁美洲的许多城市表现出相当不同的格局。殖民遗产、政府规划和非正规住区产生的城市形态并不完全符合芝加哥学派模型。
Postmodern urban forms are increasingly fragmented, decentralised and privatised. Gated communities, edge cities, business parks and mega-malls create discontinuous landscapes rather than continuous zones.
后现代城市形态日益碎片化、去中心化和私有化。封闭式社区、边缘城市、商业园区和大型购物中心创造了不连续的景观，而不是连续的圈层。
7. Factors Influencing Urban Form | 影响城市形态的因素
Urban form is shaped by a combination of physical, historical, economic, social and political factors. Understanding these factors helps explain why cities differ across regions and over time.
城市形态由自然、历史、经济、社会和政治因素共同塑造。理解这些因素有助于解释城市在不同地区和不同时期为何存在差异。
Physical factors include relief, rivers, coastlines and climate. For example, steep valleys restrict outward growth, while flat plains encourage extensive suburban sprawl.
自然因素包括地形、河流、海岸线和气候。例如，陡峭的山谷限制向外扩张，而平坦的平原鼓励大规模的郊区蔓延。
Economic forces such as land values, accessibility and agglomeration economies influence the location of firms and households. Higher land prices near the centre push land uses upward and outward.
土地价值、可达性和集聚经济等经济力量影响企业和家庭的选址。中心附近较高的地价推动土地利用向上和向外发展。
Political decisions, planning policies and infrastructure investment can override market forces. Green belts, zoning laws and new towns deliberately reshape urban form.
政治决策、规划政策和基础设施投资可以超越市场力量。绿带、分区法规和新城建设有意重塑城市形态。
8. Urban Sprawl and Counter-Urbanisation | 城市蔓延与逆城市化
Urban sprawl is the low-density, car-dependent expansion of a city into surrounding rural land. It produces fragmented suburbs, long commuting distances and a decline in the economic vitality of the inner city.
城市蔓延是指城市低密度、依赖汽车地向周围农村土地扩张。它产生碎片化的郊区、长距离通勤以及内城经济活力的下降。
Counter-urbanisation is the movement of people and employment from large cities to smaller towns and rural areas. It has been driven by rising incomes, remote working and the desire for a better quality of life.
逆城市化是人口和就业从大城市向小城镇和农村地区迁移的过程。它由收入提高、远程办公和对更高质量生活的追求所驱动。
These processes create a more dispersed urban form with multiple commuting patterns. Planners often try to contain sprawl by setting urban growth boundaries or promoting brownfield redevelopment.
这些过程创造了更分散的城市形态，具有多样的通勤模式。规划者通常试图通过设定城市增长边界或促进棕地再开发来遏制蔓延。
9. Compact City and Smart Growth | 紧凑城市与精明增长
In response to sprawl, many planners advocate the compact city model. Compact cities have higher residential densities, mixed land uses, efficient public transport and protected green space.
为应对城市蔓延，许多规划者提倡紧凑城市模式。紧凑城市具有较高的居住密度、混合的土地利用、高效的公共交通和受保护的绿色空间。
Supporters argue that compact forms reduce energy consumption, protect farmland and create vibrant neighbourhoods. Critics point out that high densities can cause overcrowding and higher housing costs.
支持者认为紧凑的城市形态能减少能源消耗、保护农田并创造充满活力的社区。批评者指出，高密度可能导致过度拥挤和更高的住房成本。
Smart growth policies aim to direct development into existing urban areas, improve public transport and create walkable communities. These policies influence the evolving form of many European cities.
精明增长政策旨在将开发引导到现有城市区域，改善公共交通并创建适合步行的社区。这些政策影响着许多欧洲城市不断演变的城市形态。
10. Case Study: London’s Evolving Form | 案例研究：伦敦城市形态的演变
London provides a rich case study of changing urban form. In the nineteenth century, London grew rapidly along railway lines and industrial corridors, creating a pattern similar to Hoyt’s sectors.
伦敦为不断变化的城市形态提供了丰富的案例研究。19 世纪，伦敦沿铁路线和工业走廊迅速扩张，形成了类似霍伊特扇形的格局。
After the Second World War, the Green Belt was created to contain outward growth. New Towns such as Stevenage and Milton Keynes were built beyond the Green Belt to accommodate overspill population.
第二次世界大战后，伦敦建立了绿带来遏制向外扩张。斯蒂夫尼奇和米尔顿凯恩斯等新城建在绿带之外，以容纳外溢人口。
Today London is polycentric
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